reproduce (this is a W=1 build): git checkout 4701f33a10702d5fc577c32434eb62adde0a1ae1 b4 shazam https://lore.kernel.org/r/20250325-unique-ref-v9-2-e91618c1de26@pm.me # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=x86_64 olddefconfig make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash rustfmtcheck